when British India ended in '47 it was 14:£.
Now that rings a bell.
Exercise Shiksha was a Javelin deployment to India in October 1963 and I was a co-pilot on a Valiant tanker crew that was flight refuelling them via Cyprus and Bahrain. Before we left we were issued with our LOA. R9/day. One of our number who had left India in 1947 told us that was what it was when he left. Because of the currency restrictions, only change £10 and have it stamped on your passport, we were given Indian rupees at R14/£. The official rate had also not changed since 1947.
You cannot blame the Air Force, there wasn't a lot of call for LOA etc, during the intervening years.
One of our number went sick in Bombay and a replacement had to be flown out. Owing to the urgency he was sent out with his LOA in Sterling. He was gettin R150 for a fiver.